Bashar, Md. Rezaul and Li, Yan and Wen, Peng (2009) EEG analysis on skull conductivity perturbations using realistic head model. In: RSKT 2009: 4th International Conference on Rough Set and Knowledge Technology , 14-16 Jul 2009, Gold Coast, Australia.
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Measurement of electroencephalogram (EEG) requires accurate estimation of tissue conductivity. Among the head tissues, skull compartment has less conductivity due to compacta and spongiosa, which impacts on EEG measurement. Therefore, skull conductivity plays a vital role in head modeling, forward computation and source localization. In this study, we have investigated the effects of scalp potentials due to skull conductivity perturbations in realistic head models using different skull to brain and/or scalp conductivity ratio (σ ratio). Several studies used this σ ratio as 1/80, however, other studies found the values of σ ratio between 1/20 and 1/72. Each head model constructed from the values of different σ ratio ranging from 1/20 to 1/72 is compared to the head model constructed from σ ratio = 1/80. The obtained results demonstrated that the skull conductivity perturbations have effects on EEG and the head model constructed from less σ ratio generates larger errors due to higher potential differences.
|Item Type:||Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)|
|Additional Information:||Series: Lecture Notes in Computer Science, v. 5589. Print copy held USQ Library 006.3 Rou. This is the authors' version of the work. It is posted here with permission of the publisher for your personal use. No further distribution is permitted.|
|Uncontrolled Keywords:||EEG; head modelling; anisotropic conductivity; MRI and FEM; electroencephalography|
|Subjects:||280000 Information, Computing and Communication Sciences > 280400 Computation Theory and Mathematics > 280499 Computation Theory and Mathematics not elsewhere classified|
|Depositing User:||Dr Yan Li|
|Date Deposited:||24 Jan 2010 02:42|
|Last Modified:||02 Jul 2013 23:36|
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